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Two issues with using ECA PKI cards: 1) to send signed email requires multiple actions of "View Security Info" under the Security tab. This predateds v68.3.0. 2) under the most recent update, emails are not always being delivered to some nrl.navy.mil addresses, and never when signed or if they include an attachment (even unsigned). I can provide bounced email with headers, but this web page would not allow loading a txt file into the image upload. Emails are delivered to .gov addresses; these were all sent using Thunderbird from jgrant@batt-tech.com. The error message includes: " ----- The following addresses had permanent fatal errors ----- <jonathan.grant.ctr@nrl.navy.mil> ----- Transcript of session follows ----- <jonathan.grant.ctr@nrl.navy.mil>... Deferred: Connection timed out with mfw.dren.mil. Message could not be delivered for 6 hours Message will be deleted from queue" Question: Is there a way to roll back to the previous version of Thunderbird?